Electric bell.



PATENTED JULY 23; 1907.

. 0. G.'0ADDEN.

ELECTRIC BELL. APPLICATION IILED 10130.1,1904.

JEN/527202", Charles 5 [7555527 227 @MM 7 CHARLES o. oADDEN,

STRUCTION COMPANY, OF BUFFALO, NEW YORK, A

OF CLEVELAND, OHIO, ASSIGNOR TO CENTURY TELEPHONE CON- CORPORATION OF NEW YORK.

ELECTRIC BELL.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed December 1, 1904- Serial No. 235,017.

To all whom it may concern:

Be it known that I, CHARLES C. CADDEN, a citizen of the United States of America, and a resident of Cleveland, in the county of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Electric Bells, of which the following is a specification.

My invention relates to an improved adjustment and mounting for the actuating parts of an electric bell or gong, and has for its object, the provision of a strong, simple and cheap mounting for such parts, and an adjustment for the vibrator, of an improved character.

In electric bells of the loud-ringing type, the throw of the armature necessarily must be effected with such force as to deliver the maximum blow upon the gong; and it is necessary, accordingly, that the armature should be securely mounted, and should have efficient adjustment to insure the proper ringing of the bell or bells. In a structure of this class, wherein two oppositely disposed bells are employed, between which the clapper is adapted to vibrate, it is desirable, if not necessary, that the throw of the armature should be adjustable upon either side; not only to secure the most efficient action of the device, but to prevent the armature from sticking to the polepieces of the field-magnet. This is an important feature, inasmuch as with a powerful field-magnet, such as is required, the well known tendency of the armature, to cling or stick to the poles of said field-magnet, and remain unresponsive to the currents, is materially increased with the strength of such field. I have, accordingly, devised means for rigidly mounting the field-magnet in a strong non-magnetic frame, which also is designed to carry the pivotally-mounted armature and bell-clapper. Extending freely through the poles of said magnet, are adjusting screws of brass or non-magnetic material, seated in oppositely disposed tapped-portions of the frame, between which screws, the armature vibrates, under the influence of electric currents.

The features of my improvements will be more readily appreciated upon making reference to the accompanying drawings, wherein Figure I. is a plan view of a loud-ringing bell embodying my improvements. Figs. II. and III. respectively, are enlarged plan and side views, showing in detail, the mounting-frame, adjustment and field magnet; and, Fig. IV. is a rear view of the device of Fig. I.

Similar parts have been designated by the same character of reference in each of the several figures of the drawings, in order to avoid any ambiguity.

Referring first to Fig. 1., the general structure of the loud-ringing bell, mounted upon a back-board a, will be at once appreciated. Two oppositely disposed bells or gongs b, are mounted at the upper part thereof, upon .posts seated in the cross-bar b, at the rear of the structure. A protective box or casing (1, shown partially broken away, is disposed about the actuating portions of the device. Securely mounted upon the backboard, is a stout frame a, of brass or other non-magnetic material, having cross-pieces 0, 0 respectively securing the upper ends of the permanent magnet d, and the yoke of said magnet, rigidly in place, by means of down wardly extending lugs or posts, indicated by dotted lines in Fig. III. These cross pieces are shown partially broken away at the left, Fig. 11., to illustrate the relation of the retaining-frame and the magnet. Pivoted between the base portion of the frame and the cross-piece 0 is the armature e, carrying the exciting coils or windings, and terminating in the wedge-shaped magnetic-block e, above which extends the bellclapper f. The windings, it will be understood, are connected between the binding posts 9 and h, by wires extending upwardly at the rear of the back-board, and through openings at the sides of the vibrating armature.

Mounted as above described, under the influence of ordinary magneto currents, the excited armature-part e will rapidly vibrate between the limiting-screws j, seated in the upper posts of the frame 0, thereby causing the bells to ring. These screws, when in adjusted position, extend a sufficient distance from the adjacent poles of the magnet, wherein holes are respectively provided to permit the passage of said screws, so that the armature-part e will not come in contact with said poles at either extremity of its throw. Moreover, said screws serve to adjust the throw of the bell-clapperf so as to insure the most efficient ringing of the bells or gongs. This adjustment being accomplished, the clamping-nuts j are tightened upon the respective screws, and retain them in proper position. The mounting frame for the field-magnet and the vibrating armature, securely holds these parts in their proper relation, and affords at the same time, an anchorage or. support for the adjusting-screws.

My improved structure provides a rigid frame for mounting the parts and embodies an adjustment of the simplest and most positive character, while permitting the ordinary form of horseshoe magnet to be used without necessitating the tapping of the hardened steel poles thereof, and at the same time, affords means for obviating any sticking or clinging of the armature to the magnet-poles, between which said armature vibrates.

It should be observed that the adjustment does not alter the position of the magnet poles, thereby avoiding the tendency of the armature to cling or stick as in certain structures of the prior art; nor does it involve the use of a specially formed sectional-magnet jointed to secure the adjustment, thus necessitating an air-gap Within the magnet-structure.

Having now described a loud-ringing bell embodying my said improvements, I claim as new, and desire to secure by Letters Patent, the following:

1. In an electric-bell, the combination with a non-magnetic frame affording; a receptacle for a magnet, of such magnet disposed therein, an armature provided with exciting windings mounted to vibrate between the poles thereof, and non-magnetic adjusting-screws positioned in the frame at either side, and extending freely through openings in the magnet within the path of movement oi said armature, serving as stops, and limiting its throw, substantially as set forth.

2. In a structure of the class described, the combination with a non-magnetic frame or supportal'tording a receptacle for a magnet, of a permanent horseshoe magnet mounted therein, a vibrating armature provided with exciting windings pivotally disposed within saidv frame in position to vibrate between the poles of said magnet, and non-magnetic adjusting-screws mounted within said frame and extending through the poles of said magnet into the path of movement of said armature, against which screws said armature abuts at either extremity of its throw, substantially as set forth.

3. In a structure of the class described, the combination with a non-iii netic frame or support afifording a receptacle for a magnet, of a permanent horseshoe magnet mounted therein, a vibrating armature provided with exciting windings pivotaily disposed within said frame in position to vibrate between the poles of said magnet, oppositely disposed bells or gongs, a bell-clapper carried by the ar mature,- and adapted alternately to strike said gangs, and non-magnetic adjusting-screws provided in the frame, against which said screws said armature is adapted to impinge, whereby the throw of the armature and bell-clapper ,is regulated, and the armature is prevented from sticking, substantially asset'i'orth 4. The combination with a non-magnetic frame 0, forming a receptacle for a magnet, of a magnet 11 securely maintained in place therein, superposed cross-pi'eces'c c bearint, thereon, an armature 0 provided with exciting windings pivoted in said frame in position to vibrate between the poles of said magnet, non-magnetic adjusting-screws j disposed within tapped openings in the non-magnetic frame and passing within the poles of the magnet in position to act as stops, an attached bell-clapper f, and bell mechanism adapted to be sounded thereby, substantially as set forth.

In testimony whereof I have signed my name in the presence of two subscribing witnesses at Cleveland, this 30th day of November, 1904.

-CHARLES C. CADDEN.

Witnesses JOHN F. McDoNXnLL, ALnnn'r LYNN LAWRENCE. 

